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Schackoina multispinata


Classification: pf_mesozoic -> Schackoinidae -> Schackoina -> Schackoina multispinata
Sister taxa: S. bicornis, S. cenomana, S. multispinata, S. sp.,

Taxonomy

Citation: Schackoina multispinata (Cushman and Wickenden, 1930)
Rank: Species
Basionym: Hantkenina multispinata
Synonyms: Schackoina moliniensis; Hantkenina trituberculata

Type images:

Original description: Hantkenina multispinata Cushman and Wickenden 1930: "Test planispiral in general, the adult chambers sometimes slightly out of alignment, earlier chambers globular but very early developing a distal tubular extension, in general in a radial position, later chambers polyhedral and with as many as five tubular processes, three chambers making up each coil; suture fairly distinct, slightly depressed; wall smooth, calcareous, thick, finely perforated; aperture a low arched opening at the base of the chamber, in the earlier stages in the median line but in the adult extending outward to the umbilical area at least on one side, with a thin lip over the opening. Length of adult about 0.24 mm.; thickness at umbilicus 0.09 mm.; at periphery of last chamber 0.18 mm. With the help of the figures definite stages may be made out: Nepionic:-Proloculum globular, nearly or quite spherical followed by at least two chambers of a similar form and nearly equal size. Neanic:- the next succeeding chamber becoming elongate in a radial direction, bluntly pointed but apparently without a definite, tubular process, succeeding chambers carrying this structure to a constantly higher degree until the chamber is longer than broad, constricted toward the proximal end and expanded in the middle, thence tapering distally into a comparatively large tubular extension. Ephebic:-The form keeps to the general planispiral development, but the chambers become much expanded, greatly broadened at right angles to the axis of coiling and irregularly polyhedral, a tubular projection developed from each of the angles with five as the maximum seen in the series of specimens studied. Gerentic:-A very few of the largest specimens show an irregularity of the chamber somewhat greater than in the ordinary adults, and may perhaps represent a gerontic character. One of the largest specimens shows an actual reduction of the processes to three in the last-formed chamber after having attained an adult chamber with five processes."

Entries in the Catalog of original descriptions: Hantkenina multispinata;
Hantkenina trituberculata; Schackoina moliniensis;

Geological Range:
Last occurrence (top): within G. ventricosa zone (76.18-79.20Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within T. globotruncanoides zone (96.08-100.50Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Stellatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Equatorial
umb chamber shape:Elongatecoiling axis:Lowperiphery:aperture border:Thin lip
sp chbr shape:Elongateumbilicus:Narrowperiph margin shape:N/Aaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5
spiral sutures:Moderately depresseddiameter mm:width mm:breadth mm:
final-whorl chambers:3.0-4.0

References:

Cushman, J.A. & Wickenden, R.T.D., (1930). The development of Hantkenina in the Cretaceous with a description of a new species. Contributions from the Cushman Laboratory for Foraminiferal. Research, 6(2): 39-43.


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Schackoina multispinata compiled by the pforams@mikrotax project team viewed: 19-8-2017

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